上一部中，超级电脑“天网”阻止人类抵抗领袖约翰·康纳诞生的行动失败，时隔13年后，在“审判日”到来之前，“天网”派出了更加先进的生化机器人T-1000（罗伯特·帕特里克 饰）从公元2029年回到洛杉矶追杀已经长大的约翰，与此同时，约翰也派出了机器人T-800（阿诺· 施瓦辛格 饰）回去保护年幼的自己。　　此时，萨拉·康纳（琳达·汉密尔顿 饰）因为怪异的言行而住进了精神疗养院，约翰则和养父母住在一起，行为叛逆。T-800找到他们，在逃避T-1000追杀过程中，获得了二人的信任。　　为了改变未来的历史，挽救人类的命运，萨拉、约翰和T-800 Model 101找到了“天网”之父，迈尔斯·戴森（乔·莫顿 饰），说服他销毁一切有关“天网”的资料，此时，警察和T-1000同时赶来，他们陷入了多方争斗中。

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Picking up from where the last season left off, security realizes that a gun was fired in Ed's suite, as Danny and Ed's daughter realize they have deeper feelings for each other than either of them wanted to admit. Samantha realizes what trouble she's in when one of her high roller clients rolls into the hotel's beach front resort in Hawaii and rolls up a half a million dollar bill and threatens to leave it in her lap, along with the dead stripper in his room.

Now the Montecito has been sold to inexperienced young widow-heiress Monica Mancuso, who had it thoroughly renovated, Ed who stayed on as general manager is worried about the top-secret reopening, especially after two recent hold-ups in Indian casinos, but Monica refuses any delay so he can work in new staff. Most old key personnel has left. Danny now heads his late dad's contracting company McCoy Construction, but accepts to return as Ed's right hand, and rehires Mike -who was parking valet- and Sam, whose clients were deserting her, only Ed's daughter refuses. The boys soon find proof the construction crews have been infiltrated as there are at least two officially dead men and computer chips have been planted to cause a blackout one minute after the grand reopening starts, far more sophisticated then in either Indian casino heist.